Engine packing



J. A. CANN AND J. surmows.

ENGINE PACKIN G. APPLICATION FILED Aus.'16'.-192|.

Patented Aug. 22, 1922;

JOHN ARTHUR CANN, OF

ailmentsn, n'nnn 'UXBB-IDGE, AND, reruns Beta-ewe, of I man, or onnon, anon inn nneInn-racnme,

, c s eeifieamm fnettersBetent.-' JQatentedAng, Application filed. August 16,1921. SerialNo.-492,814. i

(GRANTED UNDER THE raovisions or THE AM or MARCH 3,,19'21, 115mm. 1, 1313.

To all whom-it may concern:

Be it known that we, JOHN ARTHUR CANN, a subject of the Kin of Great Britain and Ireland, residing at ld Orchard, Harefield, nearUXbridge, in the county of Middlesex, England, and JAMES BURROWS, a subject of the King of Great Britain and Ireland, residing at Longsight Park Terrace, Harefield, aforesaid, have invented new and useful Improvements in Engine Packing (for which we have filed an application in Great Britain Sept. 19, 1919, No. l l7,37t), of which the following is a specification.

This invention relates to packings adapted for use in stuffing-boxes of steam-engines,

pumps and the like, and is of the class wherein several folds of woven fabric are combined with a core of Babbitt or other antifriction metal; the inner face of the core being however exposed and forming the principal portion of the wearing surface. Such packing material may be made by a continuous process, cut off in lengths corresponding with the circumference of the piston-rod, ram or plunger, to be packed, and inserted, in the form of split rings, in the stufling-bo-x 'to be packed.

An engine packing of the type above referred to and constructed according to our invention, comprises a continuous metallic core, a canvas or like backing attached to the core by means of a binding of yarn or the like, and an outer wrapping of folded canvas; the several layers of canvas or like material being treated with india rubber so lution and united by vulcaniz-ing. The-surface of the metallic core intended to form the working surface is moreover intersected by deep diagonal cross cuts or grooves which not only facilitate the bending of the metalcored packing to a circular form but furnish passages for the even distribution of the lubricant to 'the'wo'rking surface.

In the accompanying drawings, Fig. l-is a perspective view illustrating, in a partly finished state, a packin constructed accord ing to our invention; of the canvas wrapping hereinafter referred to, and Fig. 3, a perspective view of the improved packing in its completed state.

to. sisting of a strip 6 folded to a width ap- 75 i ig. 2' an edge view spondin in width with that of the metallic I core a; 1 laving placed the back or outer face i of the latter upon the folded canvas 0, we secure the two together by winding asbestos or other yarn (Z diagonally about them; the

said yarn being, in the present illustration,

inserted" in soineof the diagonal cuts or grooves 22 in the metallic core a and passing round the canvas backing 0 before referred We next form .a canvas wrapping conproximately corresponding. with the back and two sides of the combined canvas backing 0 and core a in conjunction with an unfolded strip 0 and having applied such Wrapping to the combined "metallic core and canvas base described with reference to Fig, 1, we arrange the wrapping about the latter as shownin vFig. i). VVe then place the whole in a mould'and subject it to VLllCZtIP.

ization; the several layers of canvas having,

prior to folding, been treated with india rubber solution. 1 j When a length of compound packing cone struc'ted in the manner hereinbefore described is bent to a circular form, edgesof. 9Q

adjacent diamonds and half diamonds (or squares and half-squares) approach oneanother until they become contiguous and form l a practically continuous-metallic working surface. We deem it, however, preferable to make the cross cuts or grooves of such a width, or .to restrict the bending to such an extent, thatslight interstices remain in the J working surface of'the core a. By forming the cross-cuts or grooves 12 in the manner described, they become continuousand serve as passages for the supply of lubricating fluld to all parts of the Working surface.

We c1a11n: 1. An engine-packing comprlsung a c011- tinuous metallic core, a canvas-like backing 2. An engine packing comprising a continuous metallic core a canvas-like backing attached thereto by means of a yarn-like binding, and an outer Wrapping of folded material, such as ca-nvas;'the Working surface of the core being formed With intersecting diagonal cross-cuts, which constitute continuous passages for the conveyance of 20 lubricating fluid, substantially as set forth.

JOHN ARTHUR CANN. JAMES BURROWS. 

